Vehicle control device and vehicle control system

A vehicle control system comprising:

• a vehicle having a first processor;
• and
• a server having a second processor, wherein:
• the first processor or second processor is configured to determine whether or not a difficult traveling zone where traveling of the vehicle is difficult exists between a lane change completion location which is set on a target lane as one lane of a road having multiple lanes and where movement of the vehicle from the target lane to another lane is to be completed and a current location of the vehicle,
• the first processor or second processor is configured to calculate a first distance between an end point of the difficult traveling zone in a traveling direction of the vehicle and the lane change completion location, when it has been determined that a difficult traveling zone exists,
• the first processor or second processor is configured to determine whether or not the first distance is at least a reference distance,
• the first processor or second processor is configured to decide to execute a lane change for movement of the vehicle to the target lane after the vehicle has passed through the difficult traveling zone when it has been determined that the first distance is at least the reference distance, or to decide to execute a lane change for movement of the vehicle to the target lane before the vehicle reaches the difficult traveling zone when it has been determined that the first distance is less than the reference distance, and
• the first processor executes at least one of the processing operations while the second processor executes the remaining processing operations, or the second processor executes at least one of the processing operations while the first processor executes the remaining processing operations.